Fertilization of the egg takes place inside:

In the circuit shown in the figure,the reading of the voltmeter is $V_1$ when only $S_1$ is closed,the reading of the voltmeter is $V_2$ when only $S_2$ is closed,and the reading of the voltmeter is $V_3$ when both $S_1$ and $S_2$ are closed. Then:

In recombinant $DNA$ technique,the term vector refers to

The length of the common chord of the circles of radii $15$ and $20$,whose centers are $25$ units of distance apart,is

Which of the following has the lowest boiling point?

Element having highest $I.P.$ value is